CN205283294U - Motor protection ware and plastic envelope motor - Google Patents

Abstract

The utility model is applicable to the field of motors, and discloses a motor protector and a plastic-encapsulated motor, wherein the motor protector includes a connection terminal, at least two connecting wires arranged at one end of the connection terminal, and at least two connection wires arranged at the other end of the connection terminal for The conductor that controls the conduction or disconnection of each connecting wire and the non-metallic insulating shell that covers the terminal and each conductor. The non-metallic insulating shell is also equipped with a fireproof shell. The concave cavity has a first opening through which connecting wires pass through and exposes, and a second opening through which one side of the non-metallic insulating shell is exposed for sensing the temperature of the motor. The utility model arranges a fire-proof shell outside the non-metallic insulating shell of the traditional motor protector, so that even if the motor protector has an internal fire phenomenon during the working process, the flame will not spread to the periphery of the motor protector through the fire-proof shell other components, and its cost is low.

Description

Motor protector and plastic motor

technical field

The utility model belongs to the field of motors, in particular to a motor protector and a plastic-encapsulated motor with the motor protector.

Background technique

The motor protector is an overheating and overload protection device for the motor. As shown in Figure 8, a motor protector 1' for a plastic-encapsulated motor provided by the traditional technology includes a terminal 11', two connecting wires 12' located at one end of the terminal 11', The two conductive sheets 13' at the other end and the non-metal insulating shell 14' covering the connection terminal 11' and the two conductive sheets 13'. The two connecting wires 12' are connected or disconnected through the two conductive sheets 13'. Under normal temperature conditions, the two conductive sheets 13' are in contact with each other so that the two connecting wires 12' are connected; when the motor temperature is too high , the two conductive sheets 13' will be separated so that the two connecting wires 12' will be disconnected, and then the motor will be powered off to achieve the effect of overheating protection.

When the above-mentioned traditional motor protector 1' is applied to a plastic-sealed motor, there are the following disadvantages: the plastic-sealed motor has relatively high requirements for fire prevention, however, the non-metallic insulating shell 14' of the above-mentioned traditional motor protector 1' is made of non-metallic material made, its ignition point is relatively low. There is a possibility of fire in the motor protector 1' during operation, and once it catches fire, the flame may spread to other parts around the motor protector 1' through the non-metallic insulating shell 14' of the motor protector 1', so that Plastic-encapsulated motors have great potential safety hazards during use.

In order to solve the shortcomings of the above-mentioned traditional motor protector 1', some technicians proposed to directly replace the above-mentioned traditional motor protector 1' with an existing motor protector with a relatively complicated structure. The fire protection performance of the protector, however, it also caused the following new problems: 1) It will cause a sharp increase in the cost of the motor protector; 2) The shape and size of the installation groove for installing the motor protector on the motor plastic casing are different from the traditional ones. The shape and size of the motor protector 1' match. When the traditional motor protector 1' is directly replaced with an existing motor protector with a relatively complex structure, the shape of the motor temperature protector also changes greatly. As a result, the original mounting slots on the motor plastic casing can no longer be used, and the mold of the motor plastic casing needs to be redesigned, and the mold design and manufacturing cost of the motor plastic casing is relatively expensive, which eventually leads to a sharp increase in the manufacturing cost of the plastic casing.

Utility model content

The purpose of the utility model is to overcome at least one disadvantage of the above-mentioned prior art, and provide a motor protector and a plastic-encapsulated motor, which solve the technical problem of how to improve the fireproof performance of the traditional motor protector under the premise of low cost.

In order to achieve the above purpose, the technical solution adopted by the utility model is: a motor protector, including a connection terminal, at least two connecting wires arranged at one end of the connection terminal, at least two connection wires provided at the other end of the connection terminal for A conductor that controls the conduction or disconnection of each of the connecting wires and a non-metallic insulating shell that covers the connecting terminal and each of the conductors. The non-metallic insulating shell is also provided with a fireproof shell. The fireproof The shell has a concave cavity that can accommodate the non-metallic insulating shell, and the concave cavity has a first opening through which the connecting wires are passed and exposed, and a side of the non-metallic insulating shell is exposed for sensing the temperature of the motor. Second opening.

Specifically, it is defined that the side of the non-metallic insulating casing used for sensing the temperature of the motor is the sensing surface, and the sensing surface is flush with the edge forming the second opening enclosed by the fireproof casing, or the sensing surface It protrudes from the second opening to the outside of the concave cavity.

Preferably, the height of the sensing surface protruding from the concave cavity is less than 1 mm.

Preferably, the fireproof casing is a rectangular casing with the first opening and the second opening respectively on two adjacent sides.

Preferably, the fireproof casing is a metal fireproof casing, and the metal fireproof casing is stamped or bent from a plate member; or the fireproof casing is a non-metal fireproof casing, and the non-metal fireproof casing is injection molded.

Preferably, the plate-shaped member includes a rectangular base plate, a first side plate, a second side plate and a third side plate, and the first side plate, the second side plate and the third side plate are respectively arranged on Three side edges of the rectangular substrate, and the first side plate and the second side plate are respectively arranged at two opposite side edges of the rectangular substrate.

Preferably, the non-metallic fireproof enclosure is provided with U-shaped reinforcing ribs at the edge surrounding and forming the first opening.

Preferably, the wall thickness of the fireproof enclosure is less than 2mm.

Preferably, adhesive glue is also provided between the non-metallic insulating shell and the fireproof shell.

Further, the utility model also provides a plastic-encapsulated motor, which includes a plastic-enclosed casing and the above-mentioned motor protector, the plastic-enclosed casing is provided with an installation groove, the motor protector is installed in the installation groove, and the non- One side of the metal insulating casing passes through the second opening and abuts against the plastic casing.

The motor protector and the plastic-encapsulated motor provided by the utility model are provided with a fire-proof casing outside the non-metallic insulating casing of the traditional motor protector, and specifically by setting a first opening on the fire-proof casing to avoid connecting wires, and setting on the fire-proof casing The second opening exposes one side of the non-metallic insulating casing to sense the temperature of the motor, thereby avoiding the impact of the setting of the fireproof casing on the performance of the motor protector, and at the same time, the inherent fireproof performance of the fireproof casing can be used to effectively improve the fireproof performance of the motor protector . In this way, in a specific application, even if an internal fire occurs during the operation of the motor protector, the flame will not spread to other components around the motor protector through the fireproof casing, thus effectively eliminating the need for the motor protector to burn during use. safety hazards in. At the same time, because it only adds a fire-proof shell outside the traditional motor protector, it will not cause a sharp increase in the cost of the motor protector, and will not cause a major change in the shape of the motor protector, so it does not need to be redesigned The mold for manufacturing the plastic casing of the motor will not lead to a sharp increase in the manufacturing cost of the plastic-sealed motor.

Description of drawings

Fig. 1 is an exploded schematic diagram of a motor protector provided by an embodiment of the present invention;

Fig. 2 is a schematic diagram of the assembly of the motor protector with adhesive provided by the embodiment of the present invention;

Fig. 3 is a schematic diagram of the assembly of the motor protector provided by the embodiment of the present invention without adhesive;

Fig. 4 is a three-dimensional structural schematic diagram of a metal fireproof casing provided by an embodiment of the present invention;

Fig. 5 is a schematic structural view of a plate member provided by an embodiment of the present invention;

Fig. 6 is a schematic diagram of the three-dimensional structure of the non-metallic fireproof casing provided by the embodiment of the present invention;

Fig. 7 is a schematic structural diagram of a plastic-encapsulated motor provided by an embodiment of the present invention;

Fig. 8 is an assembly diagram of a motor protector provided by conventional technology.

detailed description

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

It should be noted that when an element is described as being “fixed” or “disposed on” another element, it may be directly on the other element or there may be an intervening element at the same time. When an element is described as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present.

It should also be noted that the orientation terms such as left, right, up, down, top, and bottom in the following examples are only relative concepts or refer to the normal use status of the product, and should not be regarded as having restrictive.

As shown in Figures 1 to 7, the motor protector 1 provided by the embodiment of the present invention includes a connecting terminal 11, at least two connecting wires 12 arranged at one end of the connecting terminal 11, at least two connecting wires 12 arranged at the other end of the connecting terminal 11, and The conductor 13 used to control the conduction or disconnection of each connecting wire 12 and the non-metallic insulating shell 14 covering the connecting terminal 11 and each conductor 13, the non-metallic insulating shell 14 is also provided with a fireproof shell 15, which is fireproof The casing 15 has a concave cavity 151 that can accommodate the non-metallic insulating casing 14. The concave cavity 151 has a first opening 152 for the connecting wire 12 to pass through and expose, and a first opening 152 for one side of the non-metallic insulating casing 14 to be exposed for sensing the temperature of the motor. Two openings 153 . The setting of the first opening 152 is mainly used to prevent interference between the fireproof casing 15 and the connecting wire 12 when the fireproof casing 15 is installed. The setting of the second opening 153 is mainly used to ensure that the non-metallic insulating shell 14 can detect and sense the temperature of the motor in real time, thereby fully ensuring the protective effect of the motor protector 1 on the motor; in addition, it directly makes the non-metallic insulating shell 14 The temperature of the induction motor is conducted by means of one side being exposed, the induction is accurate and reliable, and it is beneficial to reduce the material cost of the fireproof casing 15 . The fireproof casing 15 is specifically made of a material with better fireproof performance, so that the inherent fireproof performance of the fireproof casing 15 can be used to effectively improve the fireproof performance of the motor protector 1 . In this way, in a specific application, even if an internal fire occurs in the motor protector 1 during operation, the flame will not spread to other parts around the motor protector 1 through the fireproof casing 15, thus effectively eliminating the need for motor protector 1. 1 Potential safety hazards during use. At the same time, because it only adds a fireproof casing 15 outside the traditional motor protector 1, it will not cause a sharp increase in the cost of the motor protector 1, and will not cause a large change in the shape of the motor protector 1, thereby There is no need to redesign the mold for manufacturing the motor plastic casing 2, which will not lead to a sharp increase in the manufacturing cost of the plastic-sealed motor.

Specifically, the side of the non-metallic insulating casing 14 that is used to sense the temperature of the motor is defined as the sensing surface 141. Referring to FIGS. 2 and 3 together, as a preferred implementation, the sensing surface 141 protrudes from the second opening 153. Outside the concave cavity 151, in this way, after the motor protector 1 is assembled on the plastic casing 2 of the motor, the sensing surface 141 can fully fit and contact the plastic casing 2, thereby helping to ensure the accuracy and reliability of the temperature sensing of the motor protector 1. Of course, in a specific application, the sensing surface 141 can also be designed to be just flush with the edge of the second opening 153 formed by the enclosure of the fireproof casing 15, so that the sensing surface 141 can also be realized to be in contact with the plastic-encapsulated casing 2, thereby It can also make the motor protector 1 sense the temperature of the motor.

Preferably, the height H1 of the sensing surface 141 protruding from the concave cavity 151 is less than 1 mm. If the height H1 of the sensing surface 141 protruding from the concave cavity 151 is too large, the exposed area of the non-metallic insulating casing 14 will be too large, thereby reducing the fireproof performance of the fireproof casing 15 . Here, the height H1 of the sensing surface 141 protruding outside the concave cavity 151 is designed to be less than 1 mm, which can ensure that the sensing surface 141 is fully in contact with the plastic casing 2, thereby fully ensuring the accuracy and reliability of the temperature sensing of the motor protector 1, Can fully guarantee the fireproof performance of fireproof casing 15 again, and its comprehensive effect is good.

Specifically, both the non-metal insulating casing 14 and the fireproof casing 15 are polygonal casings, and the first opening 152 and the second opening 153 are provided on two adjacent sides of the fireproof casing 15 . Preferably, the outer shape of the non-metal insulating shell 14 is a rectangle, which has a simple structure, is easy to manufacture, and has low manufacturing cost. The fireproof enclosure 15 corresponds to a rectangular shell with a first opening 152 and a second opening 153 on two adjacent sides, respectively. Of course, in a specific application, the outer shape of the non-metallic insulating casing 14 is not limited thereto, for example, the outer shape of the non-metallic insulating casing 14 may also be other polygons such as pentagon, hexagon, or trapezoid.

Define the wall surface opposite to the second opening 153 of the concave cavity 151 as the bottom of the cavity, define the distance from the edge forming the second opening 153 to the bottom of the cavity as the height H2 of the cavity 151, and define the sensing surface 141 to the non-metallic insulating shell 14 The distance from the side opposite to the sensing surface 141 is the height H3 of the non-metallic insulating shell 14, and the height H2 of the concave cavity 151 is less than the height H3 of the non-metallic insulating shell 14, so that the fireproof shell 15 is assembled with the non-metallic insulating shell 14 The rear sensing surface 141 can protrude out of the concave cavity 151 , so as to ensure that the motor protector 1 is installed on the motor and the rear sensing surface 141 can fully fit and contact the plastic casing 2 .

Preferably, referring to Fig. 4 and Fig. 5 together, as a specific embodiment of the fireproof casing 15, the fireproof casing 15 is a metal fireproof casing, that is, the fireproof casing 15 is made of a metal fireproof material. Specifically, the metal fireproof shell can be formed by stamping or bending a plate-shaped member 150 , which is simple in processing and is conducive to mass production. Here, the fireproof performance of the fireproof casing 15 can be effectively ensured by utilizing the intrinsic high ignition point performance of the metal material.

Specifically, referring to Fig. 4 and Fig. 5 together, the plate member 150 includes a rectangular base plate 1501, a first side plate 1502, a second side plate 1503 and a third side plate 1504, the first side plate 1502, the second side plate The plate 1503 and the third side plate 1504 are respectively disposed on three side edges of the rectangular substrate 1501 , and the first side plate 1502 and the second side plate 1503 are respectively disposed on two opposite side edges of the rectangular substrate 1501 . Before the bending process, the rectangular base plate 1501, the first side plate 1502, the second side plate 1503 and the third side plate 1504 are all located on the same plate surface; after the bending process, the first side plate 1502, the second side plate 1503 and the The third side plate 1504 is perpendicular to the rectangular substrate 1501, and the rectangular substrate 1501, the first side plate 1502, the second side plate 1503 and the third side plate 1504 together form a rectangle with the first opening 152 and the second opening 153 case.

Or, referring to Fig. 6, as another specific embodiment of the fireproof casing 15, the fireproof casing 15 is a non-metal fireproof casing, that is, the fireproof casing 15 is made of a non-metal fireproof material, and the nonmetal fireproof casing can be integrally injection molded. Here, the fireproof performance of the fireproof enclosure 15 can be effectively ensured by using the inherent fireproof properties of the non-metallic fireproof material.

Preferably, the non-metallic fireproof enclosure is provided with a U-shaped rib 154 at the edge surrounding and forming the first opening 152, which is conducive to improving the structural strength of the nonmetallic fireproof enclosure.

Preferably, the wall thickness b of the fireproof enclosure 15 is less than 2 mm. In this way, it is beneficial to ensure that the setting of the fireproof casing 15 will not cause a large change in the external dimensions of the motor protector 1, so that the improved motor protector 1 can still be installed in the installation groove 21 on the plastic casing 2 without the need for Redesigning the mold for manufacturing the plastic-encapsulated casing 2 will not lead to a sharp increase in the manufacturing cost of the plastic-encapsulated motor. The wall thickness b of the fireproof enclosure 15 specifically refers to the minimum distance between the inner wall and the outer wall of the fireproof enclosure 15 .

Preferably, as shown in FIG. 2 , an adhesive glue 16 (glue with good adhesive performance) is further provided between the non-metallic insulating casing 14 and the fireproof casing 15 . The setting of the adhesive 16 can effectively fill the fit gap between the non-metallic insulating shell 14 and the fireproof shell 15 on the one hand, and improve the bonding reliability of the non-metallic insulating shell 14 and the fireproof shell 15 on the other hand. Of course, as shown in FIG. 3 , in specific applications, the adhesive 16 may not be provided between the non-metallic insulating casing 14 and the fireproof casing 15 .

Preferably, the material of the non-metallic insulating shell 14 can be plastic, which can be injection-molded outside the connecting terminal 11 and each conductor 13 through a mold, so as to ensure the combination of the non-metallic insulating shell 14, the connecting terminal 11 and the conductor 13 Reliability, and help to reduce the subsequent assembly process of the non-metallic insulating shell 14, the terminal 11, and the conductor 13. Of course, the manufacturing and installation methods of the non-metallic insulating shell 14 are not limited to this.

2 and 3 together, the number of connecting wires 12 is the same as the number of conductors 13, one end of each connecting wire 12 is electrically connected to one end of each conductor 13, and at least one conductor 13 A thermal sensing element 17 is provided on it, and the thermal sensing element 17 is used to sense and detect temperature to control the conduction and disconnection between the conductors 13 , so as to realize the conductive connection or disconnection of the connecting wires 12 . Specifically, when the temperature sensed by the thermal sensing element 17 belongs to the normal operating temperature state of the plastic-encapsulated motor, each conductor 13 remains in a contact conduction state; and when the temperature sensed by the thermal sensing element 17 is too high and is higher than the During the normal working temperature state of the motor, each conductor 13 will be separated automatically.

Preferably, as shown in FIGS. 1 to 3 together, there are two connecting wires 12 and two conductors 13, and the two conductors 13 are electrically connected to the two connecting wires 12 respectively, and one of the conductors 13 is convexly provided with a thermal sensing element 17 . The thermal sensing element 17 is used to sense and detect the operating temperature of the plastic-encapsulated motor to control the suction contact or disconnection between the two conductors 13. When the two conductors 13 are sucked together, the two connecting wires 12 are in When the two conductors 13 are separated, the two connecting wires 12 are in the disconnected state. Of course, in specific applications, the number of connecting wires 12 and conductors 13 is not limited thereto.

Preferably, the conductor 13 is a sheet member. The sheet-like components can be integrally formed by stamping, which is convenient to manufacture and is conducive to mass production and manufacture. Of course, in a specific application, the shape of the conductor 13 is not limited to a sheet shape, but may also be a rod shape or other shapes.

Preferably, the fireproof casing 15 is detachably fitted outside the non-metallic insulating casing 14 , so that subsequent disassembly and installation of the fireproof casing 15 is facilitated. In a specific application, when the assembly composed of the connecting wire 12, the conductor 13 and the non-metallic insulating casing 14 is damaged, the fireproof casing 15 can be removed to replace the assembly composed of the connecting wire 12, the conductive body 13 and the non-metallic insulating casing 14. After the assembly, the fireproof casing 15 is installed, which is beneficial to the recycling of the fireproof casing 15.

Further, with reference to Fig. 2, Fig. 3 and Fig. 7, the utility model also provides a plastic-encapsulated motor, which includes a plastic-encapsulated casing 2 and the above-mentioned motor protector 1, the plastic-sealed casing 2 is provided with a mounting groove 21, and the motor The protector 1 is installed in the installation groove 21 , and one side of the non-metallic insulating casing 14 (ie, the sensing surface 141 ) passes through the second opening 153 and abuts against the plastic casing 2 . The plastic-sealed motor provided by the embodiment of the utility model adopts the above-mentioned motor protector 1, so the improvement of the fireproof performance of the plastic-sealed motor can be realized without changing the shape of the plastic-sealed casing 2, and the plastic-sealed motor can be greatly improved. The safety performance of the motor and the change of the mold of the plastic casing 2 are avoided, and the improvement cost is very low.

Specifically, as shown in FIG. 7 , the plastic-sealed motor also includes an outlet clamp 3 and a power cord 4 passing through the outlet clamp 3 inside and outside the plastic-sealed motor. The outlet clamp 3 is fixed by injection molding of the plastic casing 2 . Preferably, the installation groove 21 is arranged close to the wire outlet clip 3 , and the wire outlet clip 3 and the installation groove 21 are arranged in upper and lower positions along the axial direction of the plastic casing 2 .

Preferably, the above-mentioned plastic-encapsulated motor is a 50 Hz, 220 volt single-phase AC motor, which effectively improves the fire performance of the motor under the premise of low cost. Of course, the above-mentioned plastic-encapsulated motor can also be other types of motors.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modification, equivalent replacement or improvement made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (10)

1. A motor protector, comprising a terminal, at least two connecting wires arranged at one end of the connecting terminal, and at least two connecting wires arranged at the other end of the connecting terminal for controlling the conduction or disconnection of each of the connecting wires The conductor and the non-metallic insulating shell covering the connecting terminal and each of the conductors are characterized in that: the non-metallic insulating shell is also provided with a fire-proof shell, and the fire-proof shell has a structure capable of accommodating the non-metallic The concave cavity of the insulating shell has a first opening through which the connecting wires pass through and exposes, and a second opening through which one side of the non-metallic insulating shell is exposed for sensing the temperature of the motor. 2. The motor protector according to claim 1, characterized in that: the side of the non-metallic insulating casing used to sense the temperature of the motor is defined as the sensing surface, and the enclosure of the sensing surface and the fireproof casing forms the The edge of the second opening is flush, or the sensing surface protrudes from the second opening to the outside of the concave cavity. 3. The motor protector according to claim 2, wherein the height of the sensing surface protruding from the concave cavity is less than 1 mm. 4. The motor protector according to any one of claims 1 to 3, wherein the fireproof casing is a rectangular casing with the first opening and the second opening respectively on two adjacent sides. 5. The motor protector according to claim 4, characterized in that: the fireproof casing is a metal fireproof casing, and the metal fireproof casing is formed by punching or bending a plate member; or the fireproof casing is a non- The metal fireproof casing, the non-metal fireproof casing is injection molded. 6. The motor protector according to claim 5, wherein the plate-shaped member comprises a rectangular base plate, a first side plate, a second side plate and a third side plate, the first side plate, the The second side plate and the third side plate are respectively arranged at three side edges of the rectangular base plate, and the first side plate and the second side plate are respectively arranged on two opposite sides of the rectangular base plate at the edge. 7. The motor protector according to claim 5, characterized in that: the non-metallic fireproof casing is provided with a U-shaped reinforcing rib at the edge surrounding and forming the first opening. 8. The motor protector according to any one of claims 1 to 3, characterized in that: the wall thickness of the fireproof casing is less than 2 mm. 9. The motor protector according to any one of claims 1 to 3, characterized in that an adhesive is provided between the non-metallic insulating casing and the fireproof casing. 10. A plastic-encapsulated motor, comprising a plastic-enclosed casing, characterized in that it also includes a motor protector as claimed in any one of claims 1 to 9, the plastic-enclosed casing is provided with a mounting groove, and the motor protector is installed on the One side of the non-metal insulating shell passes through the second opening and abuts against the plastic sealing shell.